//===- lib/MC/MCKifyAsmStreamer.cpp - Text Assembly Output ----------*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//

#include "llvm/ADT/Optional.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/ADT/SmallString.h"
#include "llvm/ADT/StringExtras.h"
#include "llvm/ADT/Twine.h"
#include "llvm/DebugInfo/CodeView/SymbolRecord.h"
#include "llvm/MC/MCAsmBackend.h"
#include "llvm/MC/MCAsmInfo.h"
#include "llvm/MC/MCAssembler.h"
#include "llvm/MC/MCCodeEmitter.h"
#include "llvm/MC/MCCodeView.h"
#include "llvm/MC/MCContext.h"
#include "llvm/MC/MCExpr.h"
#include "llvm/MC/MCFixupKindInfo.h"
#include "llvm/MC/MCInst.h"
#include "llvm/MC/MCInstPrinter.h"
#include "llvm/MC/MCObjectFileInfo.h"
#include "llvm/MC/MCObjectWriter.h"
#include "llvm/MC/MCRegister.h"
#include "llvm/MC/MCRegisterInfo.h"
#include "llvm/MC/MCSectionMachO.h"
#include "llvm/MC/MCStreamer.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/Format.h"
#include "llvm/Support/FormattedStream.h"
#include "llvm/Support/LEB128.h"
#include "llvm/Support/MathExtras.h"
#include "llvm/Support/Path.h"
#include "llvm/Support/TargetRegistry.h"
#include <cctype>

#include "inc.h"

using namespace llvm;

namespace {

class MCKifyAsmStreamer final : public MCStreamer {
    std::unique_ptr<formatted_raw_ostream> OSOwner;
    formatted_raw_ostream& OS;
    const MCAsmInfo* MAI;
    std::unique_ptr<MCInstPrinter> InstPrinter;
    std::unique_ptr<MCAssembler> Assembler;

    SmallString<128> ExplicitCommentToEmit;
    SmallString<128> CommentToEmit;
    raw_svector_ostream CommentStream;
    raw_null_ostream NullStream;

    unsigned IsVerboseAsm : 1;
    unsigned ShowInst : 1;
    unsigned UseDwarfDirectory : 1;

    void EmitRegisterName(int64_t Register);
    void EmitCFIStartProcImpl(MCDwarfFrameInfo& Frame) override;
    void EmitCFIEndProcImpl(MCDwarfFrameInfo& Frame) override;

public:
    MCKifyAsmStreamer(MCContext& Context, std::unique_ptr<formatted_raw_ostream> os,
        bool isVerboseAsm, bool useDwarfDirectory,
        MCInstPrinter* printer, std::unique_ptr<MCCodeEmitter> emitter,
        std::unique_ptr<MCAsmBackend> asmbackend, bool showInst)
        : MCStreamer(Context)
        , OSOwner(std::move(os))
        , OS(*OSOwner)
        , MAI(Context.getAsmInfo())
        , InstPrinter(printer)
        , Assembler(std::make_unique<MCAssembler>(
              Context, std::move(asmbackend), std::move(emitter),
              (asmbackend) ? asmbackend->createObjectWriter(NullStream)
                           : nullptr))
        , CommentStream(CommentToEmit)
        , IsVerboseAsm(isVerboseAsm)
        , ShowInst(showInst)
        , UseDwarfDirectory(useDwarfDirectory)
    {
        assert(InstPrinter);
        if (IsVerboseAsm)
            InstPrinter->setCommentStream(CommentStream);
        if (Assembler->getBackendPtr())
            setAllowAutoPadding(Assembler->getBackend().allowAutoPadding());
    }

    MCAssembler& getAssembler() { return *Assembler; }
    MCAssembler* getAssemblerPtr() override { return nullptr; }

    inline void EmitEOL()
    {
        // Dump Explicit Comments here.
        emitExplicitComments();
        // If we don't have any comments, just emit a \n.
        if (!IsVerboseAsm) {
            OS << '\n';
            return;
        }
        EmitCommentsAndEOL();
    }

    void EmitSyntaxDirective() override;

    void EmitCommentsAndEOL();

    /// Return true if this streamer supports verbose assembly at all.
    bool isVerboseAsm() const override { return IsVerboseAsm; }

    /// Do we support EmitRawText?
    bool hasRawTextSupport() const override { return true; }

    /// Add a comment that can be emitted to the generated .s file to make the
    /// output of the compiler more readable. This only affects the MCKifyAsmStreamer
    /// and only when verbose assembly output is enabled.
    void AddComment(const Twine& T, bool EOL = true) override;

    /// Add a comment showing the encoding of an instruction.
    void AddEncodingComment(const MCInst& Inst, const MCSubtargetInfo&);

    /// Return a raw_ostream that comments can be written to.
    /// Unlike AddComment, you are required to terminate comments with \n if you
    /// use this method.
    raw_ostream& GetCommentOS() override
    {
        if (!IsVerboseAsm)
            return nulls(); // Discard comments unless in verbose asm mode.
        return CommentStream;
    }

    void emitRawComment(const Twine& T, bool TabPrefix = true) override;

    void addExplicitComment(const Twine& T) override;
    void emitExplicitComments() override;

    /// Emit a blank line to a .s file to pretty it up.
    void AddBlankLine() override
    {
        EmitEOL();
    }

    /// @name MCStreamer Interface
    /// @{

    void ChangeSection(MCSection* Section, const MCExpr* Subsection) override;

    void emitELFSymverDirective(StringRef AliasName,
        const MCSymbol* Aliasee) override;

    void EmitLOHDirective(MCLOHType Kind, const MCLOHArgs& Args) override;
    void EmitLabel(MCSymbol* Symbol, SMLoc Loc = SMLoc()) override;

    void EmitAssemblerFlag(MCAssemblerFlag Flag) override;
    void EmitLinkerOptions(ArrayRef<std::string> Options) override;
    void EmitDataRegion(MCDataRegionType Kind) override;
    void EmitVersionMin(MCVersionMinType Kind, unsigned Major, unsigned Minor,
        unsigned Update, VersionTuple SDKVersion) override;
    void EmitBuildVersion(unsigned Platform, unsigned Major, unsigned Minor,
        unsigned Update, VersionTuple SDKVersion) override;
    void EmitThumbFunc(MCSymbol* Func) override;

    void EmitAssignment(MCSymbol* Symbol, const MCExpr* Value) override;
    void EmitWeakReference(MCSymbol* Alias, const MCSymbol* Symbol) override;
    bool EmitSymbolAttribute(MCSymbol* Symbol, MCSymbolAttr Attribute) override;

    void EmitSymbolDesc(MCSymbol* Symbol, unsigned DescValue) override;
    void BeginCOFFSymbolDef(const MCSymbol* Symbol) override;
    void EmitCOFFSymbolStorageClass(int StorageClass) override;
    void EmitCOFFSymbolType(int Type) override;
    void EndCOFFSymbolDef() override;
    void EmitCOFFSafeSEH(MCSymbol const* Symbol) override;
    void EmitCOFFSymbolIndex(MCSymbol const* Symbol) override;
    void EmitCOFFSectionIndex(MCSymbol const* Symbol) override;
    void EmitCOFFSecRel32(MCSymbol const* Symbol, uint64_t Offset) override;
    void EmitCOFFImgRel32(MCSymbol const* Symbol, int64_t Offset) override;
    void EmitXCOFFLocalCommonSymbol(MCSymbol* LabelSym, uint64_t Size,
        MCSymbol* CsectSym,
        unsigned ByteAlign) override;
    void emitELFSize(MCSymbol* Symbol, const MCExpr* Value) override;
    void EmitCommonSymbol(MCSymbol* Symbol, uint64_t Size,
        unsigned ByteAlignment) override;

    /// Emit a local common (.lcomm) symbol.
    ///
    /// @param Symbol - The common symbol to emit.
    /// @param Size - The size of the common symbol.
    /// @param ByteAlignment - The alignment of the common symbol in bytes.
    void EmitLocalCommonSymbol(MCSymbol* Symbol, uint64_t Size,
        unsigned ByteAlignment) override;

    void EmitZerofill(MCSection* Section, MCSymbol* Symbol = nullptr,
        uint64_t Size = 0, unsigned ByteAlignment = 0,
        SMLoc Loc = SMLoc()) override;

    void EmitTBSSSymbol(MCSection* Section, MCSymbol* Symbol, uint64_t Size,
        unsigned ByteAlignment = 0) override;

    void EmitBinaryData(StringRef Data) override;

    void EmitBytes(StringRef Data) override;

    void EmitValueImpl(const MCExpr* Value, unsigned Size,
        SMLoc Loc = SMLoc()) override;
    void EmitIntValue(uint64_t Value, unsigned Size) override;
    void EmitIntValueInHex(uint64_t Value, unsigned Size) override;

    void EmitULEB128Value(const MCExpr* Value) override;

    void EmitSLEB128Value(const MCExpr* Value) override;

    void EmitDTPRel32Value(const MCExpr* Value) override;
    void EmitDTPRel64Value(const MCExpr* Value) override;
    void EmitTPRel32Value(const MCExpr* Value) override;
    void EmitTPRel64Value(const MCExpr* Value) override;

    void EmitGPRel64Value(const MCExpr* Value) override;

    void EmitGPRel32Value(const MCExpr* Value) override;

    void emitFill(const MCExpr& NumBytes, uint64_t FillValue,
        SMLoc Loc = SMLoc()) override;

    void emitFill(const MCExpr& NumValues, int64_t Size, int64_t Expr,
        SMLoc Loc = SMLoc()) override;

    void EmitValueToAlignment(unsigned ByteAlignment, int64_t Value = 0,
        unsigned ValueSize = 1,
        unsigned MaxBytesToEmit = 0) override;

    void EmitCodeAlignment(unsigned ByteAlignment,
        unsigned MaxBytesToEmit = 0) override;

    void emitValueToOffset(const MCExpr* Offset,
        unsigned char Value,
        SMLoc Loc) override;

    void EmitFileDirective(StringRef Filename) override;
    Expected<unsigned> tryEmitDwarfFileDirective(unsigned FileNo,
        StringRef Directory,
        StringRef Filename,
        Optional<MD5::MD5Result> Checksum = None,
        Optional<StringRef> Source = None,
        unsigned CUID = 0) override;
    void emitDwarfFile0Directive(StringRef Directory, StringRef Filename,
        Optional<MD5::MD5Result> Checksum,
        Optional<StringRef> Source,
        unsigned CUID = 0) override;
    void EmitDwarfLocDirective(unsigned FileNo, unsigned Line,
        unsigned Column, unsigned Flags,
        unsigned Isa, unsigned Discriminator,
        StringRef FileName) override;
    MCSymbol* getDwarfLineTableSymbol(unsigned CUID) override;

    bool EmitCVFileDirective(unsigned FileNo, StringRef Filename,
        ArrayRef<uint8_t> Checksum,
        unsigned ChecksumKind) override;
    bool EmitCVFuncIdDirective(unsigned FuncId) override;
    bool EmitCVInlineSiteIdDirective(unsigned FunctionId, unsigned IAFunc,
        unsigned IAFile, unsigned IALine,
        unsigned IACol, SMLoc Loc) override;
    void EmitCVLocDirective(unsigned FunctionId, unsigned FileNo, unsigned Line,
        unsigned Column, bool PrologueEnd, bool IsStmt,
        StringRef FileName, SMLoc Loc) override;
    void EmitCVLinetableDirective(unsigned FunctionId, const MCSymbol* FnStart,
        const MCSymbol* FnEnd) override;
    void EmitCVInlineLinetableDirective(unsigned PrimaryFunctionId,
        unsigned SourceFileId,
        unsigned SourceLineNum,
        const MCSymbol* FnStartSym,
        const MCSymbol* FnEndSym) override;

    void PrintCVDefRangePrefix(
        ArrayRef<std::pair<const MCSymbol*, const MCSymbol*>> Ranges);

    void EmitCVDefRangeDirective(
        ArrayRef<std::pair<const MCSymbol*, const MCSymbol*>> Ranges,
        codeview::DefRangeRegisterRelHeader DRHdr) override;

    void EmitCVDefRangeDirective(
        ArrayRef<std::pair<const MCSymbol*, const MCSymbol*>> Ranges,
        codeview::DefRangeSubfieldRegisterHeader DRHdr) override;

    void EmitCVDefRangeDirective(
        ArrayRef<std::pair<const MCSymbol*, const MCSymbol*>> Ranges,
        codeview::DefRangeRegisterHeader DRHdr) override;

    void EmitCVDefRangeDirective(
        ArrayRef<std::pair<const MCSymbol*, const MCSymbol*>> Ranges,
        codeview::DefRangeFramePointerRelHeader DRHdr) override;

    void EmitCVStringTableDirective() override;
    void EmitCVFileChecksumsDirective() override;
    void EmitCVFileChecksumOffsetDirective(unsigned FileNo) override;
    void EmitCVFPOData(const MCSymbol* ProcSym, SMLoc L) override;

    void EmitIdent(StringRef IdentString) override;
    void EmitCFIBKeyFrame() override;
    void EmitCFISections(bool EH, bool Debug) override;
    void EmitCFIDefCfa(int64_t Register, int64_t Offset) override;
    void EmitCFIDefCfaOffset(int64_t Offset) override;
    void EmitCFIDefCfaRegister(int64_t Register) override;
    void EmitCFIOffset(int64_t Register, int64_t Offset) override;
    void EmitCFIPersonality(const MCSymbol* Sym, unsigned Encoding) override;
    void EmitCFILsda(const MCSymbol* Sym, unsigned Encoding) override;
    void EmitCFIRememberState() override;
    void EmitCFIRestoreState() override;
    void EmitCFIRestore(int64_t Register) override;
    void EmitCFISameValue(int64_t Register) override;
    void EmitCFIRelOffset(int64_t Register, int64_t Offset) override;
    void EmitCFIAdjustCfaOffset(int64_t Adjustment) override;
    void EmitCFIEscape(StringRef Values) override;
    void EmitCFIGnuArgsSize(int64_t Size) override;
    void EmitCFISignalFrame() override;
    void EmitCFIUndefined(int64_t Register) override;
    void EmitCFIRegister(int64_t Register1, int64_t Register2) override;
    void EmitCFIWindowSave() override;
    void EmitCFINegateRAState() override;
    void EmitCFIReturnColumn(int64_t Register) override;

    void EmitWinCFIStartProc(const MCSymbol* Symbol, SMLoc Loc) override;
    void EmitWinCFIEndProc(SMLoc Loc) override;
    void EmitWinCFIFuncletOrFuncEnd(SMLoc Loc) override;
    void EmitWinCFIStartChained(SMLoc Loc) override;
    void EmitWinCFIEndChained(SMLoc Loc) override;
    void EmitWinCFIPushReg(MCRegister Register, SMLoc Loc) override;
    void EmitWinCFISetFrame(MCRegister Register, unsigned Offset,
        SMLoc Loc) override;
    void EmitWinCFIAllocStack(unsigned Size, SMLoc Loc) override;
    void EmitWinCFISaveReg(MCRegister Register, unsigned Offset,
        SMLoc Loc) override;
    void EmitWinCFISaveXMM(MCRegister Register, unsigned Offset,
        SMLoc Loc) override;
    void EmitWinCFIPushFrame(bool Code, SMLoc Loc) override;
    void EmitWinCFIEndProlog(SMLoc Loc) override;

    void EmitWinEHHandler(const MCSymbol* Sym, bool Unwind, bool Except,
        SMLoc Loc) override;
    void EmitWinEHHandlerData(SMLoc Loc) override;

    void emitCGProfileEntry(const MCSymbolRefExpr* From,
        const MCSymbolRefExpr* To, uint64_t Count) override;

    void EmitInstruction(const MCInst& Inst, const MCSubtargetInfo& STI) override;

    void EmitBundleAlignMode(unsigned AlignPow2) override;
    void EmitBundleLock(bool AlignToEnd) override;
    void EmitBundleUnlock() override;

    bool EmitRelocDirective(const MCExpr& Offset, StringRef Name,
        const MCExpr* Expr, SMLoc Loc,
        const MCSubtargetInfo& STI) override;

    void EmitAddrsig() override;
    void EmitAddrsigSym(const MCSymbol* Sym) override;

    /// If this file is backed by an assembly streamer, this dumps the specified
    /// string in the output .s file. This capability is indicated by the
    /// hasRawTextSupport() predicate.
    void EmitRawTextImpl(StringRef String) override;

    void FinishImpl() override;
};

} // end anonymous namespace.

void MCKifyAsmStreamer::AddComment(const Twine& T, bool EOL)
{
    if (!IsVerboseAsm)
        return;

    T.toVector(CommentToEmit);

    if (EOL)
        CommentToEmit.push_back('\n'); // Place comment in a new line.
}

void MCKifyAsmStreamer::EmitCommentsAndEOL()
{
    if (CommentToEmit.empty() && CommentStream.GetNumBytesInBuffer() == 0) {
        OS << '\n';
        return;
    }

    StringRef Comments = CommentToEmit;

    assert(Comments.back() == '\n' && "Comment array not newline terminated");
    do {
        // Emit a line of comments.
        OS.PadToColumn(MAI->getCommentColumn());
        size_t Position = Comments.find('\n');
        OS << MAI->getCommentString() << ' ' << Comments.substr(0, Position) << '\n';

        Comments = Comments.substr(Position + 1);
    } while (!Comments.empty());

    CommentToEmit.clear();
}

static inline int64_t truncateToSize(int64_t Value, unsigned Bytes)
{
    assert(Bytes > 0 && Bytes <= 8 && "Invalid size!");
    return Value & ((uint64_t)(int64_t)-1 >> (64 - Bytes * 8));
}

void MCKifyAsmStreamer::emitRawComment(const Twine& T, bool TabPrefix)
{
    if (TabPrefix)
        OS << '\t';
    OS << MAI->getCommentString() << T;
    EmitEOL();
}

void MCKifyAsmStreamer::addExplicitComment(const Twine& T)
{
    StringRef c = T.getSingleStringRef();
    if (c.equals(StringRef(MAI->getSeparatorString())))
        return;
    if (c.startswith(StringRef("//"))) {
        ExplicitCommentToEmit.append("\t");
        ExplicitCommentToEmit.append(MAI->getCommentString());
        // drop //
        ExplicitCommentToEmit.append(c.slice(2, c.size()).str());
    } else if (c.startswith(StringRef("/*"))) {
        size_t p = 2, len = c.size() - 2;
        // emit each line in comment as separate newline.
        do {
            size_t newp = std::min(len, c.find_first_of("\r\n", p));
            ExplicitCommentToEmit.append("\t");
            ExplicitCommentToEmit.append(MAI->getCommentString());
            ExplicitCommentToEmit.append(c.slice(p, newp).str());
            // If we have another line in this comment add line
            if (newp < len)
                ExplicitCommentToEmit.append("\n");
            p = newp + 1;
        } while (p < len);
    } else if (c.startswith(StringRef(MAI->getCommentString()))) {
        ExplicitCommentToEmit.append("\t");
        ExplicitCommentToEmit.append(c.str());
    } else if (c.front() == '#') {

        ExplicitCommentToEmit.append("\t");
        ExplicitCommentToEmit.append(MAI->getCommentString());
        ExplicitCommentToEmit.append(c.slice(1, c.size()).str());
    } else
        assert(false && "Unexpected Assembly Comment");
    // full line comments immediately output
    if (c.back() == '\n')
        emitExplicitComments();
}

void MCKifyAsmStreamer::emitExplicitComments()
{
    StringRef Comments = ExplicitCommentToEmit;
    if (!Comments.empty())
        OS << Comments;
    ExplicitCommentToEmit.clear();
}

void MCKifyAsmStreamer::ChangeSection(MCSection* Section,
    const MCExpr* Subsection)
{
    assert(Section && "Cannot switch to a null section!");
    if (MCTargetStreamer* TS = getTargetStreamer()) {
        TS->changeSection(getCurrentSectionOnly(), Section, Subsection, OS);
    } else {
        Section->PrintSwitchToSection(
            *MAI, getContext().getObjectFileInfo()->getTargetTriple(), OS,
            Subsection);
    }
}

void MCKifyAsmStreamer::emitELFSymverDirective(StringRef AliasName,
    const MCSymbol* Aliasee)
{
    OS << ".symver ";
    Aliasee->print(OS, MAI);
    OS << ", " << AliasName;
    EmitEOL();
}

void MCKifyAsmStreamer::EmitLabel(MCSymbol* Symbol, SMLoc Loc)
{
    MCStreamer::EmitLabel(Symbol, Loc);

    Symbol->print(OS, MAI);
    OS << MAI->getLabelSuffix();

    EmitEOL();
}

void MCKifyAsmStreamer::EmitLOHDirective(MCLOHType Kind, const MCLOHArgs& Args)
{
    StringRef str = MCLOHIdToName(Kind);

#ifndef NDEBUG
    int NbArgs = MCLOHIdToNbArgs(Kind);
    assert(NbArgs != -1 && ((size_t)NbArgs) == Args.size() && "Malformed LOH!");
    assert(str != "" && "Invalid LOH name");
#endif

    OS << "\t" << MCLOHDirectiveName() << " " << str << "\t";
    bool IsFirst = true;
    for (const MCSymbol* Arg : Args) {
        if (!IsFirst)
            OS << ", ";
        IsFirst = false;
        Arg->print(OS, MAI);
    }
    EmitEOL();
}

void MCKifyAsmStreamer::EmitAssemblerFlag(MCAssemblerFlag Flag)
{
    switch (Flag) {
    case MCAF_SyntaxUnified:
        OS << "\t.syntax unified";
        break;
    case MCAF_SubsectionsViaSymbols:
        OS << ".subsections_via_symbols";
        break;
    case MCAF_Code16:
        OS << '\t' << MAI->getCode16Directive();
        break;
    case MCAF_Code32:
        OS << '\t' << MAI->getCode32Directive();
        break;
    case MCAF_Code64:
        OS << '\t' << MAI->getCode64Directive();
        break;
    }
    EmitEOL();
}

void MCKifyAsmStreamer::EmitLinkerOptions(ArrayRef<std::string> Options)
{
    assert(!Options.empty() && "At least one option is required!");
    OS << "\t.linker_option \"" << Options[0] << '"';
    for (ArrayRef<std::string>::iterator it = Options.begin() + 1,
                                         ie = Options.end();
         it != ie; ++it) {
        OS << ", " << '"' << *it << '"';
    }
    EmitEOL();
}

void MCKifyAsmStreamer::EmitDataRegion(MCDataRegionType Kind)
{
    if (!MAI->doesSupportDataRegionDirectives())
        return;
    switch (Kind) {
    case MCDR_DataRegion:
        OS << "\t.data_region";
        break;
    case MCDR_DataRegionJT8:
        OS << "\t.data_region jt8";
        break;
    case MCDR_DataRegionJT16:
        OS << "\t.data_region jt16";
        break;
    case MCDR_DataRegionJT32:
        OS << "\t.data_region jt32";
        break;
    case MCDR_DataRegionEnd:
        OS << "\t.end_data_region";
        break;
    }
    EmitEOL();
}

static const char* getVersionMinDirective(MCVersionMinType Type)
{
    switch (Type) {
    case MCVM_WatchOSVersionMin:
        return ".watchos_version_min";
    case MCVM_TvOSVersionMin:
        return ".tvos_version_min";
    case MCVM_IOSVersionMin:
        return ".ios_version_min";
    case MCVM_OSXVersionMin:
        return ".macosx_version_min";
    }
    llvm_unreachable("Invalid MC version min type");
}

static void EmitSDKVersionSuffix(raw_ostream& OS,
    const VersionTuple& SDKVersion)
{
    if (SDKVersion.empty())
        return;
    OS << '\t' << "sdk_version " << SDKVersion.getMajor();
    if (auto Minor = SDKVersion.getMinor()) {
        OS << ", " << *Minor;
        if (auto Subminor = SDKVersion.getSubminor()) {
            OS << ", " << *Subminor;
        }
    }
}

void MCKifyAsmStreamer::EmitVersionMin(MCVersionMinType Type, unsigned Major,
    unsigned Minor, unsigned Update,
    VersionTuple SDKVersion)
{
    OS << '\t' << getVersionMinDirective(Type) << ' ' << Major << ", " << Minor;
    if (Update)
        OS << ", " << Update;
    EmitSDKVersionSuffix(OS, SDKVersion);
    EmitEOL();
}

static const char* getPlatformName(MachO::PlatformType Type)
{
    switch (Type) {
    case MachO::PLATFORM_MACOS:
        return "macos";
    case MachO::PLATFORM_IOS:
        return "ios";
    case MachO::PLATFORM_TVOS:
        return "tvos";
    case MachO::PLATFORM_WATCHOS:
        return "watchos";
    case MachO::PLATFORM_BRIDGEOS:
        return "bridgeos";
    case MachO::PLATFORM_MACCATALYST:
        return "macCatalyst";
    case MachO::PLATFORM_IOSSIMULATOR:
        return "iossimulator";
    case MachO::PLATFORM_TVOSSIMULATOR:
        return "tvossimulator";
    case MachO::PLATFORM_WATCHOSSIMULATOR:
        return "watchossimulator";
    }
    llvm_unreachable("Invalid Mach-O platform type");
}

void MCKifyAsmStreamer::EmitBuildVersion(unsigned Platform, unsigned Major,
    unsigned Minor, unsigned Update,
    VersionTuple SDKVersion)
{
    const char* PlatformName = getPlatformName((MachO::PlatformType)Platform);
    OS << "\t.build_version " << PlatformName << ", " << Major << ", " << Minor;
    if (Update)
        OS << ", " << Update;
    EmitSDKVersionSuffix(OS, SDKVersion);
    EmitEOL();
}

void MCKifyAsmStreamer::EmitThumbFunc(MCSymbol* Func)
{
    // This needs to emit to a temporary string to get properly quoted
    // MCSymbols when they have spaces in them.
    OS << "\t.thumb_func";
    // Only Mach-O hasSubsectionsViaSymbols()
    if (MAI->hasSubsectionsViaSymbols()) {
        OS << '\t';
        Func->print(OS, MAI);
    }
    EmitEOL();
}

void MCKifyAsmStreamer::EmitAssignment(MCSymbol* Symbol, const MCExpr* Value)
{
    // Do not emit a .set on inlined target assignments.
    bool EmitSet = true;
    if (auto* E = dyn_cast<MCTargetExpr>(Value))
        if (E->inlineAssignedExpr())
            EmitSet = false;
    if (EmitSet) {
        OS << ".set ";
        Symbol->print(OS, MAI);
        OS << ", ";
        Value->print(OS, MAI);

        EmitEOL();
    }

    MCStreamer::EmitAssignment(Symbol, Value);
}

void MCKifyAsmStreamer::EmitWeakReference(MCSymbol* Alias, const MCSymbol* Symbol)
{
    OS << ".weakref ";
    Alias->print(OS, MAI);
    OS << ", ";
    Symbol->print(OS, MAI);
    EmitEOL();
}

bool MCKifyAsmStreamer::EmitSymbolAttribute(MCSymbol* Symbol,
    MCSymbolAttr Attribute)
{
    switch (Attribute) {
    case MCSA_Invalid:
        llvm_unreachable("Invalid symbol attribute");
    case MCSA_ELF_TypeFunction: /// .type _foo, STT_FUNC  # aka @function
    case MCSA_ELF_TypeIndFunction: /// .type _foo, STT_GNU_IFUNC
    case MCSA_ELF_TypeObject: /// .type _foo, STT_OBJECT  # aka @object
    case MCSA_ELF_TypeTLS: /// .type _foo, STT_TLS     # aka @tls_object
    case MCSA_ELF_TypeCommon: /// .type _foo, STT_COMMON  # aka @common
    case MCSA_ELF_TypeNoType: /// .type _foo, STT_NOTYPE  # aka @notype
    case MCSA_ELF_TypeGnuUniqueObject: /// .type _foo, @gnu_unique_object
        if (!MAI->hasDotTypeDotSizeDirective())
            return false; // Symbol attribute not supported
        OS << "\t.type\t";
        Symbol->print(OS, MAI);
        OS << ',' << ((MAI->getCommentString()[0] != '@') ? '@' : '%');
        switch (Attribute) {
        default:
            return false;
        case MCSA_ELF_TypeFunction:
            OS << "function";
            break;
        case MCSA_ELF_TypeIndFunction:
            OS << "gnu_indirect_function";
            break;
        case MCSA_ELF_TypeObject:
            OS << "object";
            break;
        case MCSA_ELF_TypeTLS:
            OS << "tls_object";
            break;
        case MCSA_ELF_TypeCommon:
            OS << "common";
            break;
        case MCSA_ELF_TypeNoType:
            OS << "notype";
            break;
        case MCSA_ELF_TypeGnuUniqueObject:
            OS << "gnu_unique_object";
            break;
        }
        EmitEOL();
        return true;
    case MCSA_Global: // .globl/.global
        OS << MAI->getGlobalDirective();
        break;
    case MCSA_LGlobal:
        OS << "\t.lglobl\t";
        break;
    case MCSA_Hidden:
        OS << "\t.hidden\t";
        break;
    case MCSA_IndirectSymbol:
        OS << "\t.indirect_symbol\t";
        break;
    case MCSA_Internal:
        OS << "\t.internal\t";
        break;
    case MCSA_LazyReference:
        OS << "\t.lazy_reference\t";
        break;
    case MCSA_Local:
        OS << "\t.local\t";
        break;
    case MCSA_NoDeadStrip:
        if (!MAI->hasNoDeadStrip())
            return false;
        OS << "\t.no_dead_strip\t";
        break;
    case MCSA_SymbolResolver:
        OS << "\t.symbol_resolver\t";
        break;
    case MCSA_AltEntry:
        OS << "\t.alt_entry\t";
        break;
    case MCSA_PrivateExtern:
        OS << "\t.private_extern\t";
        break;
    case MCSA_Protected:
        OS << "\t.protected\t";
        break;
    case MCSA_Reference:
        OS << "\t.reference\t";
        break;
    case MCSA_Weak:
        OS << MAI->getWeakDirective();
        break;
    case MCSA_WeakDefinition:
        OS << "\t.weak_definition\t";
        break;
        // .weak_reference
    case MCSA_WeakReference:
        OS << MAI->getWeakRefDirective();
        break;
    case MCSA_WeakDefAutoPrivate:
        OS << "\t.weak_def_can_be_hidden\t";
        break;
    case MCSA_Cold:
        // Assemblers currently do not support a .cold directive.
        return false;
    }

    Symbol->print(OS, MAI);
    EmitEOL();

    return true;
}

void MCKifyAsmStreamer::EmitSymbolDesc(MCSymbol* Symbol, unsigned DescValue)
{
    OS << ".desc" << ' ';
    Symbol->print(OS, MAI);
    OS << ',' << DescValue;
    EmitEOL();
}

void MCKifyAsmStreamer::EmitSyntaxDirective()
{
    if (MAI->getAssemblerDialect() == 1) {
        OS << "\t.intel_syntax noprefix";
        EmitEOL();
    }
    // FIXME: Currently emit unprefix'ed registers.
    // The intel_syntax directive has one optional argument
    // with may have a value of prefix or noprefix.
}

void MCKifyAsmStreamer::BeginCOFFSymbolDef(const MCSymbol* Symbol)
{
    OS << "\t.def\t ";
    Symbol->print(OS, MAI);
    OS << ';';
    EmitEOL();
}

void MCKifyAsmStreamer::EmitCOFFSymbolStorageClass(int StorageClass)
{
    OS << "\t.scl\t" << StorageClass << ';';
    EmitEOL();
}

void MCKifyAsmStreamer::EmitCOFFSymbolType(int Type)
{
    OS << "\t.type\t" << Type << ';';
    EmitEOL();
}

void MCKifyAsmStreamer::EndCOFFSymbolDef()
{
    OS << "\t.endef";
    EmitEOL();
}

void MCKifyAsmStreamer::EmitCOFFSafeSEH(MCSymbol const* Symbol)
{
    OS << "\t.safeseh\t";
    Symbol->print(OS, MAI);
    EmitEOL();
}

void MCKifyAsmStreamer::EmitCOFFSymbolIndex(MCSymbol const* Symbol)
{
    OS << "\t.symidx\t";
    Symbol->print(OS, MAI);
    EmitEOL();
}

void MCKifyAsmStreamer::EmitCOFFSectionIndex(MCSymbol const* Symbol)
{
    OS << "\t.secidx\t";
    Symbol->print(OS, MAI);
    EmitEOL();
}

void MCKifyAsmStreamer::EmitCOFFSecRel32(MCSymbol const* Symbol, uint64_t Offset)
{
    OS << "\t.secrel32\t";
    Symbol->print(OS, MAI);
    if (Offset != 0)
        OS << '+' << Offset;
    EmitEOL();
}

void MCKifyAsmStreamer::EmitCOFFImgRel32(MCSymbol const* Symbol, int64_t Offset)
{
    OS << "\t.rva\t";
    Symbol->print(OS, MAI);
    if (Offset > 0)
        OS << '+' << Offset;
    else if (Offset < 0)
        OS << '-' << -Offset;
    EmitEOL();
}

// We need an XCOFF-specific version of this directive as the AIX syntax
// requires a QualName argument identifying the csect name and storage mapping
// class to appear before the alignment if we are specifying it.
void MCKifyAsmStreamer::EmitXCOFFLocalCommonSymbol(MCSymbol* LabelSym,
    uint64_t Size,
    MCSymbol* CsectSym,
    unsigned ByteAlignment)
{
    assert(MAI->getLCOMMDirectiveAlignmentType() == LCOMM::Log2Alignment && "We only support writing log base-2 alignment format with XCOFF.");
    assert(isPowerOf2_32(ByteAlignment) && "Alignment must be a power of 2.");

    OS << "\t.lcomm\t";
    LabelSym->print(OS, MAI);
    OS << ',' << Size << ',';
    CsectSym->print(OS, MAI);
    OS << ',' << Log2_32(ByteAlignment);

    EmitEOL();
}

void MCKifyAsmStreamer::emitELFSize(MCSymbol* Symbol, const MCExpr* Value)
{
    assert(MAI->hasDotTypeDotSizeDirective());
    OS << "\t.size\t";
    Symbol->print(OS, MAI);
    OS << ", ";
    Value->print(OS, MAI);
    EmitEOL();
}

void MCKifyAsmStreamer::EmitCommonSymbol(MCSymbol* Symbol, uint64_t Size,
    unsigned ByteAlignment)
{
    OS << "\t.comm\t";
    Symbol->print(OS, MAI);
    OS << ',' << Size;

    if (ByteAlignment != 0) {
        if (MAI->getCOMMDirectiveAlignmentIsInBytes())
            OS << ',' << ByteAlignment;
        else
            OS << ',' << Log2_32(ByteAlignment);
    }
    EmitEOL();
}

void MCKifyAsmStreamer::EmitLocalCommonSymbol(MCSymbol* Symbol, uint64_t Size,
    unsigned ByteAlign)
{
    OS << "\t.lcomm\t";
    Symbol->print(OS, MAI);
    OS << ',' << Size;

    if (ByteAlign > 1) {
        switch (MAI->getLCOMMDirectiveAlignmentType()) {
        case LCOMM::NoAlignment:
            llvm_unreachable("alignment not supported on .lcomm!");
        case LCOMM::ByteAlignment:
            OS << ',' << ByteAlign;
            break;
        case LCOMM::Log2Alignment:
            assert(isPowerOf2_32(ByteAlign) && "alignment must be a power of 2");
            OS << ',' << Log2_32(ByteAlign);
            break;
        }
    }
    EmitEOL();
}

void MCKifyAsmStreamer::EmitZerofill(MCSection* Section, MCSymbol* Symbol,
    uint64_t Size, unsigned ByteAlignment,
    SMLoc Loc)
{
    if (Symbol)
        AssignFragment(Symbol, &Section->getDummyFragment());

    // Note: a .zerofill directive does not switch sections.
    OS << ".zerofill ";

    assert(Section->getVariant() == MCSection::SV_MachO && ".zerofill is a Mach-O specific directive");
    // This is a mach-o specific directive.

    const MCSectionMachO* MOSection = ((const MCSectionMachO*)Section);
    OS << MOSection->getSegmentName() << "," << MOSection->getSectionName();

    if (Symbol) {
        OS << ',';
        Symbol->print(OS, MAI);
        OS << ',' << Size;
        if (ByteAlignment != 0)
            OS << ',' << Log2_32(ByteAlignment);
    }
    EmitEOL();
}

// .tbss sym, size, align
// This depends that the symbol has already been mangled from the original,
// e.g. _a.
void MCKifyAsmStreamer::EmitTBSSSymbol(MCSection* Section, MCSymbol* Symbol,
    uint64_t Size, unsigned ByteAlignment)
{
    AssignFragment(Symbol, &Section->getDummyFragment());

    assert(Symbol && "Symbol shouldn't be NULL!");
    // Instead of using the Section we'll just use the shortcut.

    assert(Section->getVariant() == MCSection::SV_MachO && ".zerofill is a Mach-O specific directive");
    // This is a mach-o specific directive and section.

    OS << ".tbss ";
    Symbol->print(OS, MAI);
    OS << ", " << Size;

    // Output align if we have it.  We default to 1 so don't bother printing
    // that.
    if (ByteAlignment > 1)
        OS << ", " << Log2_32(ByteAlignment);

    EmitEOL();
}

static inline char toOctal(int X) { return (X & 7) + '0'; }

static void PrintQuotedString(StringRef Data, raw_ostream& OS)
{
    OS << '"';

    for (unsigned i = 0, e = Data.size(); i != e; ++i) {
        unsigned char C = Data[i];
        if (C == '"' || C == '\\') {
            OS << '\\' << (char)C;
            continue;
        }

        if (isPrint((unsigned char)C)) {
            OS << (char)C;
            continue;
        }

        switch (C) {
        case '\b':
            OS << "\\b";
            break;
        case '\f':
            OS << "\\f";
            break;
        case '\n':
            OS << "\\n";
            break;
        case '\r':
            OS << "\\r";
            break;
        case '\t':
            OS << "\\t";
            break;
        default:
            OS << '\\';
            OS << toOctal(C >> 6);
            OS << toOctal(C >> 3);
            OS << toOctal(C >> 0);
            break;
        }
    }

    OS << '"';
}

void MCKifyAsmStreamer::EmitBytes(StringRef Data)
{
    assert(getCurrentSectionOnly() && "Cannot emit contents before setting section!");
    if (Data.empty())
        return;

    // If only single byte is provided or no ascii or asciz directives is
    // supported, emit as vector of 8bits data.
    if (Data.size() == 1 || !(MAI->getAscizDirective() || MAI->getAsciiDirective())) {
        if (MCTargetStreamer* TS = getTargetStreamer()) {
            TS->emitRawBytes(Data);
        } else {
            const char* Directive = MAI->getData8bitsDirective();
            for (const unsigned char C : Data.bytes()) {
                OS << Directive << (unsigned)C;
                EmitEOL();
            }
        }
        return;
    }

    // If the data ends with 0 and the target supports .asciz, use it, otherwise
    // use .ascii
    if (MAI->getAscizDirective() && Data.back() == 0) {
        OS << MAI->getAscizDirective();
        Data = Data.substr(0, Data.size() - 1);
    } else {
        OS << MAI->getAsciiDirective();
    }

    PrintQuotedString(Data, OS);
    EmitEOL();
}

void MCKifyAsmStreamer::EmitBinaryData(StringRef Data)
{
    // This is binary data. Print it in a grid of hex bytes for readability.
    const size_t Cols = 4;
    for (size_t I = 0, EI = alignTo(Data.size(), Cols); I < EI; I += Cols) {
        size_t J = I, EJ = std::min(I + Cols, Data.size());
        assert(EJ > 0);
        OS << MAI->getData8bitsDirective();
        for (; J < EJ - 1; ++J)
            OS << format("0x%02x", uint8_t(Data[J])) << ", ";
        OS << format("0x%02x", uint8_t(Data[J]));
        EmitEOL();
    }
}

void MCKifyAsmStreamer::EmitIntValue(uint64_t Value, unsigned Size)
{
    EmitValue(MCConstantExpr::create(Value, getContext()), Size);
}

void MCKifyAsmStreamer::EmitIntValueInHex(uint64_t Value, unsigned Size)
{
    EmitValue(MCConstantExpr::create(Value, getContext(), true), Size);
}

void MCKifyAsmStreamer::EmitValueImpl(const MCExpr* Value, unsigned Size,
    SMLoc Loc)
{
    assert(Size <= 8 && "Invalid size");
    assert(getCurrentSectionOnly() && "Cannot emit contents before setting section!");
    const char* Directive = nullptr;
    switch (Size) {
    default:
        break;
    case 1:
        Directive = MAI->getData8bitsDirective();
        break;
    case 2:
        Directive = MAI->getData16bitsDirective();
        break;
    case 4:
        Directive = MAI->getData32bitsDirective();
        break;
    case 8:
        Directive = MAI->getData64bitsDirective();
        break;
    }

    if (!Directive) {
        int64_t IntValue;
        if (!Value->evaluateAsAbsolute(IntValue))
            report_fatal_error("Don't know how to emit this value.");

        // We couldn't handle the requested integer size so we fallback by breaking
        // the request down into several, smaller, integers.
        // Since sizes greater or equal to "Size" are invalid, we use the greatest
        // power of 2 that is less than "Size" as our largest piece of granularity.
        bool IsLittleEndian = MAI->isLittleEndian();
        for (unsigned Emitted = 0; Emitted != Size;) {
            unsigned Remaining = Size - Emitted;
            // The size of our partial emission must be a power of two less than
            // Size.
            unsigned EmissionSize = PowerOf2Floor(std::min(Remaining, Size - 1));
            // Calculate the byte offset of our partial emission taking into account
            // the endianness of the target.
            unsigned ByteOffset = IsLittleEndian ? Emitted : (Remaining - EmissionSize);
            uint64_t ValueToEmit = IntValue >> (ByteOffset * 8);
            // We truncate our partial emission to fit within the bounds of the
            // emission domain.  This produces nicer output and silences potential
            // truncation warnings when round tripping through another assembler.
            uint64_t Shift = 64 - EmissionSize * 8;
            assert(Shift < static_cast<uint64_t>(
                       std::numeric_limits<unsigned long long>::digits)
                && "undefined behavior");
            ValueToEmit &= ~0ULL >> Shift;
            EmitIntValue(ValueToEmit, EmissionSize);
            Emitted += EmissionSize;
        }
        return;
    }

    assert(Directive && "Invalid size for machine code value!");
    OS << Directive;
    if (MCTargetStreamer* TS = getTargetStreamer()) {
        TS->emitValue(Value);
    } else {
        Value->print(OS, MAI);
        EmitEOL();
    }
}

void MCKifyAsmStreamer::EmitULEB128Value(const MCExpr* Value)
{
    int64_t IntValue;
    if (Value->evaluateAsAbsolute(IntValue)) {
        EmitULEB128IntValue(IntValue);
        return;
    }
    OS << "\t.uleb128 ";
    Value->print(OS, MAI);
    EmitEOL();
}

void MCKifyAsmStreamer::EmitSLEB128Value(const MCExpr* Value)
{
    int64_t IntValue;
    if (Value->evaluateAsAbsolute(IntValue)) {
        EmitSLEB128IntValue(IntValue);
        return;
    }
    OS << "\t.sleb128 ";
    Value->print(OS, MAI);
    EmitEOL();
}

void MCKifyAsmStreamer::EmitDTPRel64Value(const MCExpr* Value)
{
    assert(MAI->getDTPRel64Directive() != nullptr);
    OS << MAI->getDTPRel64Directive();
    Value->print(OS, MAI);
    EmitEOL();
}

void MCKifyAsmStreamer::EmitDTPRel32Value(const MCExpr* Value)
{
    assert(MAI->getDTPRel32Directive() != nullptr);
    OS << MAI->getDTPRel32Directive();
    Value->print(OS, MAI);
    EmitEOL();
}

void MCKifyAsmStreamer::EmitTPRel64Value(const MCExpr* Value)
{
    assert(MAI->getTPRel64Directive() != nullptr);
    OS << MAI->getTPRel64Directive();
    Value->print(OS, MAI);
    EmitEOL();
}

void MCKifyAsmStreamer::EmitTPRel32Value(const MCExpr* Value)
{
    assert(MAI->getTPRel32Directive() != nullptr);
    OS << MAI->getTPRel32Directive();
    Value->print(OS, MAI);
    EmitEOL();
}

void MCKifyAsmStreamer::EmitGPRel64Value(const MCExpr* Value)
{
    assert(MAI->getGPRel64Directive() != nullptr);
    OS << MAI->getGPRel64Directive();
    Value->print(OS, MAI);
    EmitEOL();
}

void MCKifyAsmStreamer::EmitGPRel32Value(const MCExpr* Value)
{
    assert(MAI->getGPRel32Directive() != nullptr);
    OS << MAI->getGPRel32Directive();
    Value->print(OS, MAI);
    EmitEOL();
}

void MCKifyAsmStreamer::emitFill(const MCExpr& NumBytes, uint64_t FillValue,
    SMLoc Loc)
{
    int64_t IntNumBytes;
    if (NumBytes.evaluateAsAbsolute(IntNumBytes) && IntNumBytes == 0)
        return;

    if (const char* ZeroDirective = MAI->getZeroDirective()) {
        // FIXME: Emit location directives
        OS << ZeroDirective;
        NumBytes.print(OS, MAI);
        if (FillValue != 0)
            OS << ',' << (int)FillValue;
        EmitEOL();
        return;
    }

    MCStreamer::emitFill(NumBytes, FillValue);
}

void MCKifyAsmStreamer::emitFill(const MCExpr& NumValues, int64_t Size,
    int64_t Expr, SMLoc Loc)
{
    // FIXME: Emit location directives
    OS << "\t.fill\t";
    NumValues.print(OS, MAI);
    OS << ", " << Size << ", 0x";
    OS.write_hex(truncateToSize(Expr, 4));
    EmitEOL();
}

void MCKifyAsmStreamer::EmitValueToAlignment(unsigned ByteAlignment, int64_t Value,
    unsigned ValueSize,
    unsigned MaxBytesToEmit)
{
    if (MAI->useDotAlignForAlignment()) {
        if (!isPowerOf2_32(ByteAlignment))
            report_fatal_error("Only power-of-two alignments are supported "
                               "with .align.");
        OS << "\t.align\t";
        OS << Log2_32(ByteAlignment);
        EmitEOL();
        return;
    }

    // Some assemblers don't support non-power of two alignments, so we always
    // emit alignments as a power of two if possible.
    if (isPowerOf2_32(ByteAlignment)) {
        switch (ValueSize) {
        default:
            llvm_unreachable("Invalid size for machine code value!");
        case 1:
            OS << "\t.p2align\t";
            break;
        case 2:
            OS << ".p2alignw ";
            break;
        case 4:
            OS << ".p2alignl ";
            break;
        case 8:
            llvm_unreachable("Unsupported alignment size!");
        }

        OS << Log2_32(ByteAlignment);

        if (Value || MaxBytesToEmit) {
            OS << ", 0x";
            OS.write_hex(truncateToSize(Value, ValueSize));

            if (MaxBytesToEmit)
                OS << ", " << MaxBytesToEmit;
        }
        EmitEOL();
        return;
    }

    // Non-power of two alignment.  This is not widely supported by assemblers.
    // FIXME: Parameterize this based on MAI.
    switch (ValueSize) {
    default:
        llvm_unreachable("Invalid size for machine code value!");
    case 1:
        OS << ".balign";
        break;
    case 2:
        OS << ".balignw";
        break;
    case 4:
        OS << ".balignl";
        break;
    case 8:
        llvm_unreachable("Unsupported alignment size!");
    }

    OS << ' ' << ByteAlignment;
    OS << ", " << truncateToSize(Value, ValueSize);
    if (MaxBytesToEmit)
        OS << ", " << MaxBytesToEmit;
    EmitEOL();
}

void MCKifyAsmStreamer::EmitCodeAlignment(unsigned ByteAlignment,
    unsigned MaxBytesToEmit)
{
    // Emit with a text fill value.
    EmitValueToAlignment(ByteAlignment, MAI->getTextAlignFillValue(),
        1, MaxBytesToEmit);
}

void MCKifyAsmStreamer::emitValueToOffset(const MCExpr* Offset,
    unsigned char Value,
    SMLoc Loc)
{
    // FIXME: Verify that Offset is associated with the current section.
    OS << ".org ";
    Offset->print(OS, MAI);
    OS << ", " << (unsigned)Value;
    EmitEOL();
}

void MCKifyAsmStreamer::EmitFileDirective(StringRef Filename)
{
    assert(MAI->hasSingleParameterDotFile());
    OS << "\t.file\t";
    PrintQuotedString(Filename, OS);
    EmitEOL();
}

static void printDwarfFileDirective(unsigned FileNo, StringRef Directory,
    StringRef Filename,
    Optional<MD5::MD5Result> Checksum,
    Optional<StringRef> Source,
    bool UseDwarfDirectory,
    raw_svector_ostream& OS)
{
    SmallString<128> FullPathName;

    if (!UseDwarfDirectory && !Directory.empty()) {
        if (sys::path::is_absolute(Filename))
            Directory = "";
        else {
            FullPathName = Directory;
            sys::path::append(FullPathName, Filename);
            Directory = "";
            Filename = FullPathName;
        }
    }

    OS << "\t.file\t" << FileNo << ' ';
    if (!Directory.empty()) {
        PrintQuotedString(Directory, OS);
        OS << ' ';
    }
    PrintQuotedString(Filename, OS);
    if (Checksum)
        OS << " md5 0x" << Checksum->digest();
    if (Source) {
        OS << " source ";
        PrintQuotedString(*Source, OS);
    }
}

Expected<unsigned> MCKifyAsmStreamer::tryEmitDwarfFileDirective(
    unsigned FileNo, StringRef Directory, StringRef Filename,
    Optional<MD5::MD5Result> Checksum, Optional<StringRef> Source, unsigned CUID)
{
    assert(CUID == 0 && "multiple CUs not supported by MCKifyAsmStreamer");

    MCDwarfLineTable& Table = getContext().getMCDwarfLineTable(CUID);
    unsigned NumFiles = Table.getMCDwarfFiles().size();
    Expected<unsigned> FileNoOrErr = Table.tryGetFile(Directory, Filename, Checksum, Source,
        getContext().getDwarfVersion(), FileNo);
    if (!FileNoOrErr)
        return FileNoOrErr.takeError();
    FileNo = FileNoOrErr.get();
    if (NumFiles == Table.getMCDwarfFiles().size())
        return FileNo;

    SmallString<128> Str;
    raw_svector_ostream OS1(Str);
    printDwarfFileDirective(FileNo, Directory, Filename, Checksum, Source,
        UseDwarfDirectory, OS1);

    if (MCTargetStreamer* TS = getTargetStreamer())
        TS->emitDwarfFileDirective(OS1.str());
    else
        EmitRawText(OS1.str());

    return FileNo;
}

void MCKifyAsmStreamer::emitDwarfFile0Directive(StringRef Directory,
    StringRef Filename,
    Optional<MD5::MD5Result> Checksum,
    Optional<StringRef> Source,
    unsigned CUID)
{
    assert(CUID == 0);
    // .file 0 is new for DWARF v5.
    if (getContext().getDwarfVersion() < 5)
        return;
    // Inform MCDwarf about the root file.
    getContext().setMCLineTableRootFile(CUID, Directory, Filename, Checksum,
        Source);

    SmallString<128> Str;
    raw_svector_ostream OS1(Str);
    printDwarfFileDirective(0, Directory, Filename, Checksum, Source,
        UseDwarfDirectory, OS1);

    if (MCTargetStreamer* TS = getTargetStreamer())
        TS->emitDwarfFileDirective(OS1.str());
    else
        EmitRawText(OS1.str());
}

void MCKifyAsmStreamer::EmitDwarfLocDirective(unsigned FileNo, unsigned Line,
    unsigned Column, unsigned Flags,
    unsigned Isa,
    unsigned Discriminator,
    StringRef FileName)
{
    OS << "\t.loc\t" << FileNo << " " << Line << " " << Column;
    if (MAI->supportsExtendedDwarfLocDirective()) {
        if (Flags & DWARF2_FLAG_BASIC_BLOCK)
            OS << " basic_block";
        if (Flags & DWARF2_FLAG_PROLOGUE_END)
            OS << " prologue_end";
        if (Flags & DWARF2_FLAG_EPILOGUE_BEGIN)
            OS << " epilogue_begin";

        unsigned OldFlags = getContext().getCurrentDwarfLoc().getFlags();
        if ((Flags & DWARF2_FLAG_IS_STMT) != (OldFlags & DWARF2_FLAG_IS_STMT)) {
            OS << " is_stmt ";

            if (Flags & DWARF2_FLAG_IS_STMT)
                OS << "1";
            else
                OS << "0";
        }

        if (Isa)
            OS << " isa " << Isa;
        if (Discriminator)
            OS << " discriminator " << Discriminator;
    }

    if (IsVerboseAsm) {
        OS.PadToColumn(MAI->getCommentColumn());
        OS << MAI->getCommentString() << ' ' << FileName << ':'
           << Line << ':' << Column;
    }
    EmitEOL();
    this->MCStreamer::EmitDwarfLocDirective(FileNo, Line, Column, Flags,
        Isa, Discriminator, FileName);
}

MCSymbol* MCKifyAsmStreamer::getDwarfLineTableSymbol(unsigned CUID)
{
    // Always use the zeroth line table, since asm syntax only supports one line
    // table for now.
    return MCStreamer::getDwarfLineTableSymbol(0);
}

bool MCKifyAsmStreamer::EmitCVFileDirective(unsigned FileNo, StringRef Filename,
    ArrayRef<uint8_t> Checksum,
    unsigned ChecksumKind)
{
    if (!getContext().getCVContext().addFile(*this, FileNo, Filename, Checksum,
            ChecksumKind))
        return false;

    OS << "\t.cv_file\t" << FileNo << ' ';
    PrintQuotedString(Filename, OS);

    if (!ChecksumKind) {
        EmitEOL();
        return true;
    }

    OS << ' ';
    PrintQuotedString(toHex(Checksum), OS);
    OS << ' ' << ChecksumKind;

    EmitEOL();
    return true;
}

bool MCKifyAsmStreamer::EmitCVFuncIdDirective(unsigned FuncId)
{
    OS << "\t.cv_func_id " << FuncId << '\n';
    return MCStreamer::EmitCVFuncIdDirective(FuncId);
}

bool MCKifyAsmStreamer::EmitCVInlineSiteIdDirective(unsigned FunctionId,
    unsigned IAFunc,
    unsigned IAFile,
    unsigned IALine, unsigned IACol,
    SMLoc Loc)
{
    OS << "\t.cv_inline_site_id " << FunctionId << " within " << IAFunc
       << " inlined_at " << IAFile << ' ' << IALine << ' ' << IACol << '\n';
    return MCStreamer::EmitCVInlineSiteIdDirective(FunctionId, IAFunc, IAFile,
        IALine, IACol, Loc);
}

void MCKifyAsmStreamer::EmitCVLocDirective(unsigned FunctionId, unsigned FileNo,
    unsigned Line, unsigned Column,
    bool PrologueEnd, bool IsStmt,
    StringRef FileName, SMLoc Loc)
{
    // Validate the directive.
    if (!checkCVLocSection(FunctionId, FileNo, Loc))
        return;

    OS << "\t.cv_loc\t" << FunctionId << " " << FileNo << " " << Line << " "
       << Column;
    if (PrologueEnd)
        OS << " prologue_end";

    if (IsStmt)
        OS << " is_stmt 1";

    if (IsVerboseAsm) {
        OS.PadToColumn(MAI->getCommentColumn());
        OS << MAI->getCommentString() << ' ' << FileName << ':' << Line << ':'
           << Column;
    }
    EmitEOL();
}

void MCKifyAsmStreamer::EmitCVLinetableDirective(unsigned FunctionId,
    const MCSymbol* FnStart,
    const MCSymbol* FnEnd)
{
    OS << "\t.cv_linetable\t" << FunctionId << ", ";
    FnStart->print(OS, MAI);
    OS << ", ";
    FnEnd->print(OS, MAI);
    EmitEOL();
    this->MCStreamer::EmitCVLinetableDirective(FunctionId, FnStart, FnEnd);
}

void MCKifyAsmStreamer::EmitCVInlineLinetableDirective(unsigned PrimaryFunctionId,
    unsigned SourceFileId,
    unsigned SourceLineNum,
    const MCSymbol* FnStartSym,
    const MCSymbol* FnEndSym)
{
    OS << "\t.cv_inline_linetable\t" << PrimaryFunctionId << ' ' << SourceFileId
       << ' ' << SourceLineNum << ' ';
    FnStartSym->print(OS, MAI);
    OS << ' ';
    FnEndSym->print(OS, MAI);
    EmitEOL();
    this->MCStreamer::EmitCVInlineLinetableDirective(
        PrimaryFunctionId, SourceFileId, SourceLineNum, FnStartSym, FnEndSym);
}

void MCKifyAsmStreamer::PrintCVDefRangePrefix(
    ArrayRef<std::pair<const MCSymbol*, const MCSymbol*>> Ranges)
{
    OS << "\t.cv_def_range\t";
    for (std::pair<const MCSymbol*, const MCSymbol*> Range : Ranges) {
        OS << ' ';
        Range.first->print(OS, MAI);
        OS << ' ';
        Range.second->print(OS, MAI);
    }
}

void MCKifyAsmStreamer::EmitCVDefRangeDirective(
    ArrayRef<std::pair<const MCSymbol*, const MCSymbol*>> Ranges,
    codeview::DefRangeRegisterRelHeader DRHdr)
{
    PrintCVDefRangePrefix(Ranges);
    OS << ", reg_rel, ";
    OS << DRHdr.Register << ", " << DRHdr.Flags << ", "
       << DRHdr.BasePointerOffset;
    EmitEOL();
}

void MCKifyAsmStreamer::EmitCVDefRangeDirective(
    ArrayRef<std::pair<const MCSymbol*, const MCSymbol*>> Ranges,
    codeview::DefRangeSubfieldRegisterHeader DRHdr)
{
    PrintCVDefRangePrefix(Ranges);
    OS << ", subfield_reg, ";
    OS << DRHdr.Register << ", " << DRHdr.OffsetInParent;
    EmitEOL();
}

void MCKifyAsmStreamer::EmitCVDefRangeDirective(
    ArrayRef<std::pair<const MCSymbol*, const MCSymbol*>> Ranges,
    codeview::DefRangeRegisterHeader DRHdr)
{
    PrintCVDefRangePrefix(Ranges);
    OS << ", reg, ";
    OS << DRHdr.Register;
    EmitEOL();
}

void MCKifyAsmStreamer::EmitCVDefRangeDirective(
    ArrayRef<std::pair<const MCSymbol*, const MCSymbol*>> Ranges,
    codeview::DefRangeFramePointerRelHeader DRHdr)
{
    PrintCVDefRangePrefix(Ranges);
    OS << ", frame_ptr_rel, ";
    OS << DRHdr.Offset;
    EmitEOL();
}

void MCKifyAsmStreamer::EmitCVStringTableDirective()
{
    OS << "\t.cv_stringtable";
    EmitEOL();
}

void MCKifyAsmStreamer::EmitCVFileChecksumsDirective()
{
    OS << "\t.cv_filechecksums";
    EmitEOL();
}

void MCKifyAsmStreamer::EmitCVFileChecksumOffsetDirective(unsigned FileNo)
{
    OS << "\t.cv_filechecksumoffset\t" << FileNo;
    EmitEOL();
}

void MCKifyAsmStreamer::EmitCVFPOData(const MCSymbol* ProcSym, SMLoc L)
{
    OS << "\t.cv_fpo_data\t";
    ProcSym->print(OS, MAI);
    EmitEOL();
}

void MCKifyAsmStreamer::EmitIdent(StringRef IdentString)
{
    assert(MAI->hasIdentDirective() && ".ident directive not supported");
    OS << "\t.ident\t";
    PrintQuotedString(IdentString, OS);
    EmitEOL();
}

void MCKifyAsmStreamer::EmitCFISections(bool EH, bool Debug)
{
    MCStreamer::EmitCFISections(EH, Debug);
    OS << "\t.cfi_sections ";
    if (EH) {
        OS << ".eh_frame";
        if (Debug)
            OS << ", .debug_frame";
    } else if (Debug) {
        OS << ".debug_frame";
    }

    EmitEOL();
}

void MCKifyAsmStreamer::EmitCFIStartProcImpl(MCDwarfFrameInfo& Frame)
{
    OS << "\t.cfi_startproc";
    if (Frame.IsSimple)
        OS << " simple";
    EmitEOL();
}

void MCKifyAsmStreamer::EmitCFIEndProcImpl(MCDwarfFrameInfo& Frame)
{
    MCStreamer::EmitCFIEndProcImpl(Frame);
    OS << "\t.cfi_endproc";
    EmitEOL();
}

void MCKifyAsmStreamer::EmitRegisterName(int64_t Register)
{
    if (!MAI->useDwarfRegNumForCFI()) {
        // User .cfi_* directives can use arbitrary DWARF register numbers, not
        // just ones that map to LLVM register numbers and have known names.
        // Fall back to using the original number directly if no name is known.
        const MCRegisterInfo* MRI = getContext().getRegisterInfo();
        if (Optional<unsigned> LLVMRegister = MRI->getLLVMRegNum(Register, true)) {
            InstPrinter->printRegName(OS, *LLVMRegister);
            return;
        }
    }
    OS << Register;
}

void MCKifyAsmStreamer::EmitCFIDefCfa(int64_t Register, int64_t Offset)
{
    MCStreamer::EmitCFIDefCfa(Register, Offset);
    OS << "\t.cfi_def_cfa ";
    EmitRegisterName(Register);
    OS << ", " << Offset;
    EmitEOL();
}

void MCKifyAsmStreamer::EmitCFIDefCfaOffset(int64_t Offset)
{
    MCStreamer::EmitCFIDefCfaOffset(Offset);
    OS << "\t.cfi_def_cfa_offset " << Offset;
    EmitEOL();
}

static void PrintCFIEscape(llvm::formatted_raw_ostream& OS, StringRef Values)
{
    OS << "\t.cfi_escape ";
    if (!Values.empty()) {
        size_t e = Values.size() - 1;
        for (size_t i = 0; i < e; ++i)
            OS << format("0x%02x", uint8_t(Values[i])) << ", ";
        OS << format("0x%02x", uint8_t(Values[e]));
    }
}

void MCKifyAsmStreamer::EmitCFIEscape(StringRef Values)
{
    MCStreamer::EmitCFIEscape(Values);
    PrintCFIEscape(OS, Values);
    EmitEOL();
}

void MCKifyAsmStreamer::EmitCFIGnuArgsSize(int64_t Size)
{
    MCStreamer::EmitCFIGnuArgsSize(Size);

    uint8_t Buffer[16] = { dwarf::DW_CFA_GNU_args_size };
    unsigned Len = encodeULEB128(Size, Buffer + 1) + 1;

    PrintCFIEscape(OS, StringRef((const char*)&Buffer[0], Len));
    EmitEOL();
}

void MCKifyAsmStreamer::EmitCFIDefCfaRegister(int64_t Register)
{
    MCStreamer::EmitCFIDefCfaRegister(Register);
    OS << "\t.cfi_def_cfa_register ";
    EmitRegisterName(Register);
    EmitEOL();
}

void MCKifyAsmStreamer::EmitCFIOffset(int64_t Register, int64_t Offset)
{
    this->MCStreamer::EmitCFIOffset(Register, Offset);
    OS << "\t.cfi_offset ";
    EmitRegisterName(Register);
    OS << ", " << Offset;
    EmitEOL();
}

void MCKifyAsmStreamer::EmitCFIPersonality(const MCSymbol* Sym,
    unsigned Encoding)
{
    MCStreamer::EmitCFIPersonality(Sym, Encoding);
    OS << "\t.cfi_personality " << Encoding << ", ";
    Sym->print(OS, MAI);
    EmitEOL();
}

void MCKifyAsmStreamer::EmitCFILsda(const MCSymbol* Sym, unsigned Encoding)
{
    MCStreamer::EmitCFILsda(Sym, Encoding);
    OS << "\t.cfi_lsda " << Encoding << ", ";
    Sym->print(OS, MAI);
    EmitEOL();
}

void MCKifyAsmStreamer::EmitCFIRememberState()
{
    MCStreamer::EmitCFIRememberState();
    OS << "\t.cfi_remember_state";
    EmitEOL();
}

void MCKifyAsmStreamer::EmitCFIRestoreState()
{
    MCStreamer::EmitCFIRestoreState();
    OS << "\t.cfi_restore_state";
    EmitEOL();
}

void MCKifyAsmStreamer::EmitCFIRestore(int64_t Register)
{
    MCStreamer::EmitCFIRestore(Register);
    OS << "\t.cfi_restore ";
    EmitRegisterName(Register);
    EmitEOL();
}

void MCKifyAsmStreamer::EmitCFISameValue(int64_t Register)
{
    MCStreamer::EmitCFISameValue(Register);
    OS << "\t.cfi_same_value ";
    EmitRegisterName(Register);
    EmitEOL();
}

void MCKifyAsmStreamer::EmitCFIRelOffset(int64_t Register, int64_t Offset)
{
    MCStreamer::EmitCFIRelOffset(Register, Offset);
    OS << "\t.cfi_rel_offset ";
    EmitRegisterName(Register);
    OS << ", " << Offset;
    EmitEOL();
}

void MCKifyAsmStreamer::EmitCFIAdjustCfaOffset(int64_t Adjustment)
{
    MCStreamer::EmitCFIAdjustCfaOffset(Adjustment);
    OS << "\t.cfi_adjust_cfa_offset " << Adjustment;
    EmitEOL();
}

void MCKifyAsmStreamer::EmitCFISignalFrame()
{
    MCStreamer::EmitCFISignalFrame();
    OS << "\t.cfi_signal_frame";
    EmitEOL();
}

void MCKifyAsmStreamer::EmitCFIUndefined(int64_t Register)
{
    MCStreamer::EmitCFIUndefined(Register);
    OS << "\t.cfi_undefined " << Register;
    EmitEOL();
}

void MCKifyAsmStreamer::EmitCFIRegister(int64_t Register1, int64_t Register2)
{
    MCStreamer::EmitCFIRegister(Register1, Register2);
    OS << "\t.cfi_register " << Register1 << ", " << Register2;
    EmitEOL();
}

void MCKifyAsmStreamer::EmitCFIWindowSave()
{
    MCStreamer::EmitCFIWindowSave();
    OS << "\t.cfi_window_save";
    EmitEOL();
}

void MCKifyAsmStreamer::EmitCFINegateRAState()
{
    MCStreamer::EmitCFINegateRAState();
    OS << "\t.cfi_negate_ra_state";
    EmitEOL();
}

void MCKifyAsmStreamer::EmitCFIReturnColumn(int64_t Register)
{
    MCStreamer::EmitCFIReturnColumn(Register);
    OS << "\t.cfi_return_column " << Register;
    EmitEOL();
}

void MCKifyAsmStreamer::EmitCFIBKeyFrame()
{
    MCStreamer::EmitCFIBKeyFrame();
    OS << "\t.cfi_b_key_frame";
    EmitEOL();
}

void MCKifyAsmStreamer::EmitWinCFIStartProc(const MCSymbol* Symbol, SMLoc Loc)
{
    MCStreamer::EmitWinCFIStartProc(Symbol, Loc);

    OS << ".seh_proc ";
    Symbol->print(OS, MAI);
    EmitEOL();
}

void MCKifyAsmStreamer::EmitWinCFIEndProc(SMLoc Loc)
{
    MCStreamer::EmitWinCFIEndProc(Loc);

    OS << "\t.seh_endproc";
    EmitEOL();
}

// TODO: Implement
void MCKifyAsmStreamer::EmitWinCFIFuncletOrFuncEnd(SMLoc Loc)
{
}

void MCKifyAsmStreamer::EmitWinCFIStartChained(SMLoc Loc)
{
    MCStreamer::EmitWinCFIStartChained(Loc);

    OS << "\t.seh_startchained";
    EmitEOL();
}

void MCKifyAsmStreamer::EmitWinCFIEndChained(SMLoc Loc)
{
    MCStreamer::EmitWinCFIEndChained(Loc);

    OS << "\t.seh_endchained";
    EmitEOL();
}

void MCKifyAsmStreamer::EmitWinEHHandler(const MCSymbol* Sym, bool Unwind,
    bool Except, SMLoc Loc)
{
    MCStreamer::EmitWinEHHandler(Sym, Unwind, Except, Loc);

    OS << "\t.seh_handler ";
    Sym->print(OS, MAI);
    if (Unwind)
        OS << ", @unwind";
    if (Except)
        OS << ", @except";
    EmitEOL();
}

void MCKifyAsmStreamer::EmitWinEHHandlerData(SMLoc Loc)
{
    MCStreamer::EmitWinEHHandlerData(Loc);

    // Switch sections. Don't call SwitchSection directly, because that will
    // cause the section switch to be visible in the emitted assembly.
    // We only do this so the section switch that terminates the handler
    // data block is visible.
    WinEH::FrameInfo* CurFrame = getCurrentWinFrameInfo();

    // Do nothing if no frame is open. MCStreamer should've already reported an
    // error.
    if (!CurFrame)
        return;

    MCSection* TextSec = &CurFrame->Function->getSection();
    MCSection* XData = getAssociatedXDataSection(TextSec);
    SwitchSectionNoChange(XData);

    OS << "\t.seh_handlerdata";
    EmitEOL();
}

void MCKifyAsmStreamer::EmitWinCFIPushReg(MCRegister Register, SMLoc Loc)
{
    MCStreamer::EmitWinCFIPushReg(Register, Loc);

    OS << "\t.seh_pushreg ";
    InstPrinter->printRegName(OS, Register);
    EmitEOL();
}

void MCKifyAsmStreamer::EmitWinCFISetFrame(MCRegister Register, unsigned Offset,
    SMLoc Loc)
{
    MCStreamer::EmitWinCFISetFrame(Register, Offset, Loc);

    OS << "\t.seh_setframe ";
    InstPrinter->printRegName(OS, Register);
    OS << ", " << Offset;
    EmitEOL();
}

void MCKifyAsmStreamer::EmitWinCFIAllocStack(unsigned Size, SMLoc Loc)
{
    MCStreamer::EmitWinCFIAllocStack(Size, Loc);

    OS << "\t.seh_stackalloc " << Size;
    EmitEOL();
}

void MCKifyAsmStreamer::EmitWinCFISaveReg(MCRegister Register, unsigned Offset,
    SMLoc Loc)
{
    MCStreamer::EmitWinCFISaveReg(Register, Offset, Loc);

    OS << "\t.seh_savereg ";
    InstPrinter->printRegName(OS, Register);
    OS << ", " << Offset;
    EmitEOL();
}

void MCKifyAsmStreamer::EmitWinCFISaveXMM(MCRegister Register, unsigned Offset,
    SMLoc Loc)
{
    MCStreamer::EmitWinCFISaveXMM(Register, Offset, Loc);

    OS << "\t.seh_savexmm ";
    InstPrinter->printRegName(OS, Register);
    OS << ", " << Offset;
    EmitEOL();
}

void MCKifyAsmStreamer::EmitWinCFIPushFrame(bool Code, SMLoc Loc)
{
    MCStreamer::EmitWinCFIPushFrame(Code, Loc);

    OS << "\t.seh_pushframe";
    if (Code)
        OS << " @code";
    EmitEOL();
}

void MCKifyAsmStreamer::EmitWinCFIEndProlog(SMLoc Loc)
{
    MCStreamer::EmitWinCFIEndProlog(Loc);

    OS << "\t.seh_endprologue";
    EmitEOL();
}

void MCKifyAsmStreamer::emitCGProfileEntry(const MCSymbolRefExpr* From,
    const MCSymbolRefExpr* To,
    uint64_t Count)
{
    OS << "\t.cg_profile ";
    From->getSymbol().print(OS, MAI);
    OS << ", ";
    To->getSymbol().print(OS, MAI);
    OS << ", " << Count;
    EmitEOL();
}

void MCKifyAsmStreamer::AddEncodingComment(const MCInst& Inst,
    const MCSubtargetInfo& STI)
{
    raw_ostream& OS = GetCommentOS();
    SmallString<256> Code;
    SmallVector<MCFixup, 4> Fixups;
    raw_svector_ostream VecOS(Code);

    // If we have no code emitter, don't emit code.
    if (!getAssembler().getEmitterPtr())
        return;

    getAssembler().getEmitter().encodeInstruction(Inst, VecOS, Fixups, STI);

    // If we are showing fixups, create symbolic markers in the encoded
    // representation. We do this by making a per-bit map to the fixup item index,
    // then trying to display it as nicely as possible.
    SmallVector<uint8_t, 64> FixupMap;
    FixupMap.resize(Code.size() * 8);
    for (unsigned i = 0, e = Code.size() * 8; i != e; ++i)
        FixupMap[i] = 0;

    for (unsigned i = 0, e = Fixups.size(); i != e; ++i) {
        MCFixup& F = Fixups[i];
        const MCFixupKindInfo& Info = getAssembler().getBackend().getFixupKindInfo(F.getKind());
        for (unsigned j = 0; j != Info.TargetSize; ++j) {
            unsigned Index = F.getOffset() * 8 + Info.TargetOffset + j;
            assert(Index < Code.size() * 8 && "Invalid offset in fixup!");
            FixupMap[Index] = 1 + i;
        }
    }

    // FIXME: Note the fixup comments for Thumb2 are completely bogus since the
    // high order halfword of a 32-bit Thumb2 instruction is emitted first.
    OS << "encoding: [";
    for (unsigned i = 0, e = Code.size(); i != e; ++i) {
        if (i)
            OS << ',';

        // See if all bits are the same map entry.
        uint8_t MapEntry = FixupMap[i * 8 + 0];
        for (unsigned j = 1; j != 8; ++j) {
            if (FixupMap[i * 8 + j] == MapEntry)
                continue;

            MapEntry = uint8_t(~0U);
            break;
        }

        if (MapEntry != uint8_t(~0U)) {
            if (MapEntry == 0) {
                OS << format("0x%02x", uint8_t(Code[i]));
            } else {
                if (Code[i]) {
                    // FIXME: Some of the 8 bits require fix up.
                    OS << format("0x%02x", uint8_t(Code[i])) << '\''
                       << char('A' + MapEntry - 1) << '\'';
                } else
                    OS << char('A' + MapEntry - 1);
            }
        } else {
            // Otherwise, write out in binary.
            OS << "0b";
            for (unsigned j = 8; j--;) {
                unsigned Bit = (Code[i] >> j) & 1;

                unsigned FixupBit;
                if (MAI->isLittleEndian())
                    FixupBit = i * 8 + j;
                else
                    FixupBit = i * 8 + (7 - j);

                if (uint8_t MapEntry = FixupMap[FixupBit]) {
                    assert(Bit == 0 && "Encoder wrote into fixed up bit!");
                    OS << char('A' + MapEntry - 1);
                } else
                    OS << Bit;
            }
        }
    }
    OS << "]\n";

    for (unsigned i = 0, e = Fixups.size(); i != e; ++i) {
        MCFixup& F = Fixups[i];
        const MCFixupKindInfo& Info = getAssembler().getBackend().getFixupKindInfo(F.getKind());
        OS << "  fixup " << char('A' + i) << " - "
           << "offset: " << F.getOffset()
           << ", value: " << *F.getValue() << ", kind: " << Info.Name << "\n";
    }
}

void MCKifyAsmStreamer::EmitInstruction(const MCInst& Inst,
    const MCSubtargetInfo& STI)
{
    assert(getCurrentSectionOnly() && "Cannot emit contents before setting section!");

    // Show the encoding in a comment if we have a code emitter.
    AddEncodingComment(Inst, STI);

    // Show the MCInst if enabled.
    if (ShowInst) {
        Inst.dump_pretty(GetCommentOS(), InstPrinter.get(), "\n ");
        GetCommentOS() << "\n";
    }

    if (getTargetStreamer())
        getTargetStreamer()->prettyPrintAsm(*InstPrinter, 0, Inst, STI, OS);
    else
        InstPrinter->printInst(&Inst, 0, "", STI, OS);

    StringRef Comments = CommentToEmit;
    if (Comments.size() && Comments.back() != '\n')
        GetCommentOS() << "\n";

    EmitEOL();
}

void MCKifyAsmStreamer::EmitBundleAlignMode(unsigned AlignPow2)
{
    OS << "\t.bundle_align_mode " << AlignPow2;
    EmitEOL();
}

void MCKifyAsmStreamer::EmitBundleLock(bool AlignToEnd)
{
    OS << "\t.bundle_lock";
    if (AlignToEnd)
        OS << " align_to_end";
    EmitEOL();
}

void MCKifyAsmStreamer::EmitBundleUnlock()
{
    OS << "\t.bundle_unlock";
    EmitEOL();
}

bool MCKifyAsmStreamer::EmitRelocDirective(const MCExpr& Offset, StringRef Name,
    const MCExpr* Expr, SMLoc,
    const MCSubtargetInfo& STI)
{
    OS << "\t.reloc ";
    Offset.print(OS, MAI);
    OS << ", " << Name;
    if (Expr) {
        OS << ", ";
        Expr->print(OS, MAI);
    }
    EmitEOL();
    return false;
}

void MCKifyAsmStreamer::EmitAddrsig()
{
    OS << "\t.addrsig";
    EmitEOL();
}

void MCKifyAsmStreamer::EmitAddrsigSym(const MCSymbol* Sym)
{
    OS << "\t.addrsig_sym ";
    Sym->print(OS, MAI);
    EmitEOL();
}

/// EmitRawText - If this file is backed by an assembly streamer, this dumps
/// the specified string in the output .s file.  This capability is
/// indicated by the hasRawTextSupport() predicate.
void MCKifyAsmStreamer::EmitRawTextImpl(StringRef String)
{
    if (!String.empty() && String.back() == '\n')
        String = String.substr(0, String.size() - 1);
    OS << String;
    EmitEOL();
}

void MCKifyAsmStreamer::FinishImpl()
{
    // If we are generating dwarf for assembly source files dump out the sections.
    if (getContext().getGenDwarfForAssembly())
        MCGenDwarfInfo::Emit(this);

    // Emit the label for the line table, if requested - since the rest of the
    // line table will be defined by .loc/.file directives, and not emitted
    // directly, the label is the only work required here.
    const auto& Tables = getContext().getMCDwarfLineTables();
    if (!Tables.empty()) {
        assert(Tables.size() == 1 && "asm output only supports one line table");
        if (auto* Label = Tables.begin()->second.getLabel()) {
            SwitchSection(getContext().getObjectFileInfo()->getDwarfLineSection());
            EmitLabel(Label);
        }
    }
}


llvm::MCStreamer* llvm::kifycreateAsmStreamer(MCContext& Context,
    std::unique_ptr<formatted_raw_ostream> OS,
    bool isVerboseAsm, bool useDwarfDirectory,
    MCInstPrinter* IP,
    std::unique_ptr<MCCodeEmitter>&& CE,
    std::unique_ptr<MCAsmBackend>&& MAB,
    bool ShowInst)
{
    return new MCKifyAsmStreamer(Context, std::move(OS), isVerboseAsm,
        useDwarfDirectory, IP, std::move(CE), std::move(MAB),
        ShowInst);
}

llvm::MCStreamer* llvm::kify_nncreateAsmStreamer(MCContext& Ctx,
    std::unique_ptr<formatted_raw_ostream> OS,
    bool IsVerboseAsm, bool UseDwarfDirectory,
    MCInstPrinter* InstPrint,
    std::unique_ptr<MCCodeEmitter>&& CE,
    std::unique_ptr<MCAsmBackend>&& TAB,
    bool ShowInst, const Target* TheTarget)
{
    formatted_raw_ostream& OSRef = *OS;
    MCStreamer* S = kifycreateAsmStreamer(
        Ctx, std::move(OS), IsVerboseAsm, UseDwarfDirectory, InstPrint,
        std::move(CE), std::move(TAB), ShowInst);
    TheTarget->createAsmTargetStreamer(*S, OSRef, InstPrint, IsVerboseAsm);
    return S;
}
